This sounds like your configuration is changed recently, because there was no changes related to QUIC for a long time.
You may try to use a workaround:
TLDR: if you are having flaky QUIC connectivity, go to the config file, and add an explicit interface address to the line server address line. e.g.: server.address: 10.0.17.120:28967
Backstory: I noticed that this morning, at 7:30PM PST according to the logs all three my nodes on three separate machines, in three separate states, connected in two different ways (one directly, and the other two over VPS) all lost ability to see QUICK. It was rather bizarre, and I don’t know why that happened. Th…